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Rulon Bearings

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Mateck Sapphire Aluminium oxide Substrate, Al2O3
Categories: Ceramic; Oxide; Aluminum Oxide

Material Notes: Substrate single crystals for superconductivity.

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Physical PropertiesOriginal ValueComments
Density 3.98 g/cc
a Lattice Constant 4.77 Å
c Lattice Constant 13.04 Å
 
Electrical PropertiesOriginal ValueComments
Dielectric Constant 9.0parallel c-axis
 11.5perpendicular c-axis
Dielectric Loss Index 0.000030
@Frequency 1e+10 Hz
parallel C-axis
 0.000086
@Frequency 1e+10 Hz
perpendicular C-axis
 
Thermal PropertiesOriginal ValueComments
CTE, linear 5.00 µm/m-°Cperpendicular C-axis
 6.70 µm/m-°Cparallel C-axis
Melting Point 2040 °C
 
Descriptive Properties
Flatness (µm/10mm), max0.3
Growth TechniquesCzochralski
Orientation(0001), (1-102), (11-20)
Orientation Accuracy ( ° ), Max0.5
Parallelness ( ° ), max0.3
Polishingone side or both sides epi-polished
Production MethodCzochralski, HEM, Verneuil
Roughness of surface (angstroms), max10
Scratchesnone
Standard Size (mm)10 x 10 x 1 or 0.5
Statemonocrystalline
Structurehexagonal
Surface Qualitywith light microscope without defects
Tolerance of Length (mm)± 0.02
Tolerance of Thickness (mm)± 0.02

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CMAT001 / 87685

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